EQ300 Series Graphic Equalizers - USER'S GUIDE 15-BAND 2/3 OCTAVE EQUALIZER EQ341 DUAL CHANNEL - ART Pro Audio
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EQ300 Series
Graphic Equalizers
EQ341 DUAL CHANNEL 15-BAND 2/3 OCTAVE EQUALIZER
EQ351 SINGLE CHANNEL 31-BAND 1/3 OCTAVE EQUALIZER
EQ355 DUAL CHANNEL 31-BAND 1/3 OCTAVE EQUALIZER
USER'S GUIDEIMPORTANT SAFETY INSTRUCTIONS – READ FIRST
This symbol, wherever it appears, This symbol, wherever it appears, alerts you
alerts you to the presence of uninsulated to important operating and maintenance
dangerous voltages inside the enclosure that instructions in the accompanying literature.
may be sufficient to constitute a risk of shock. Please read the manual.
Read instructions
Retain these safety and operating instructions for future reference. Heed all warnings printed here and on the
equipment. Follow the operating instructions printed in this user guide.
Do not open
There are no user serviceable parts inside. Refer any service work to qualified technical personnel only.
Power sources
Only connect the unit to mains power of the type described in this user guide or marked on the rear panel. The
power source must provide a good ground connection.
Power cord
Use the power cord with sealed mains plug appropriate for your local main supply as provided with the
equipment. If the provided plug does not fit into you outlet consult your service agent. Route the power cord so
that it is not likely to be walked on, stretched or pinched by items placed upon or against.
Grounding
Do not defeat the grounding and polarization means of the power cord plug. Do not remove or tamper with the
ground connection on the power cord.
Moisture
To reduce the risk of fire or electrical shock, do not expose the unit to rain, moisture or use in damp or wet
conditions. Do not place container of liquid on it, which may spill into any openings
Heat
Do not locate the unit in a place close to excessive heat or direct sunlight, as this could be a fire hazard.
Locate the unit away from any equipment, which produces heat such as: power supplies, power amplifiers and
heaters.
Environment
Protect from excessive dirt, dust, heat, and vibration when operating and storing. Avoid tobacco ash, drink
spillage and smoke especially that associated with smoke machines.
Handling
Protect the controls from damage during transit. Use adequate padding if you need to ship the unit. To avoid
injury to yourself or damage to the equipment take care when lifting, moving or carrying the unit.
Servicing
Switch off the equipment and unplug the power cord immediately if it is exposed to moisture, spilled liquid or
the power cord or plug becomes damaged during a lightning storm or if smoke odor or noise is noted. Refer
servicing to qualified technical personnel only.
Installation
Install the unit in accordance with the instruction printed in the user guide.
2IMPORTANT SAFETY INSTRUCTIONS – READ FIRST ................................................................. 2
OVERVIEW ..................................................................................................................................................................... 4
GENERAL INFORMATION .................................................................................................................................. 5
INSTALLATION.............................................................................................................................................. 5
POWER CONNECTORS ............................................................................................................................... 5
INPUT/OUTPUT CONNECTIONS.................................................................................................................. 5
SIGNAL LEVELS............................................................................................................................................ 5
CHASSIS GROUNDING ................................................................................................................................ 6
INITIAL SETUP .............................................................................................................................................. 6
OPERATION .................................................................................................................................................................. 7
FRONT PANEL CONTROLS ........................................................................................................................... 7
POWER SWITCH ....................................................................................................................................... 7
FILTER LEVEL CONTROLS....................................................................................................................... 7
FILTER RANGE SWITCH & INDICATORS ................................................................................................. 7
BYPASS SWITCH & CLIP INDICATOR LED .............................................................................................. 7
HI PASS FILTER (LOW-CUT FREQUENCY CONTROL) (EQ351 and EQ355 only) ................................. 8
LOW PASS FILTER (HIGH-CUT FREQUENCY CONTROL) (EQ351 and EQ355 only)............................ 8
LEVEL CONTROL ...................................................................................................................................... 8
REAR PANEL CONNECTORS & CONTROLS ................................................................................... 9
POWER CORD........................................................................................................................................... 9
FUSE HOLDER, LINE VOLTAGE SWITCH & GROUNDING SCREW ........................................................ 9
GROUND LIFT SWITCH............................................................................................................................. 9
INPUT/OUTPUT CONNECTORS ............................................................................................................. 10
APPLICATIONS ......................................................................................................................................................... 12
WARRANTY INFORMATION ............................................................................................................................ 13
Limited Warranty....................................................................................................................................... 13
Exclusions................................................................................................................................................. 13
SERVICE ........................................................................................................................................................................ 14
SPECIFICATIONS .................................................................................................................................................... 15
3OVERVIEW
The ART EQ300 Series of graphic equalizers have been designed and engineered to
extremely high standards for audio performance and functionality. These innovative,
high-quality equalizers are perfect for virtually any audio application where precision
frequency tailoring, reliable performance, rugged design and extremely silent
processing is important.
Active Filter Sections
A passive bypass switch allows for direct
The EQ300 Series of graphic equalizers feature comparison between the equalized and non-
active filter sections, which incorporate a constant- equalized signal for each channel.
Q design. This constant-Q design, with accurate
precision center frequencies), ensures that the Multiple Connectivity
bandwidth of every individual filter will be narrow The EQ300 Series of graphic equalizers can be
enough to prevent unnecessary interaction connected with a wide variety of audio devices.
between filters, yet still create an equalization curve Each unit has three sets of input and output
wide enough to produce the exact and precise connectors wired in parallel. These connections
processing of audio frequencies the user seeks. include XLR connectors, 1/4" phone jacks and RCA
phono jacks.
Precision Slide Potentiometers
The EQ300 Series of graphic equalizers utilize Durability by Design
20mm precision slide potentiometers. These The EQ300 Series of graphic equalizers are
center-detented, precision faders are graphically designed and engineered to be durable and
positioned on ISO center frequencies between rugged. They are an ideal choice when the need for
25Hz-16kHz for the EQ341, 20Hz to 20kHz for the a robust equalizer is of paramount concern. They
EQ351 and EQ355. are designed for mounting in a standard 19"
equipment rack or one of the many rack-type
Independent Variable Hi and Low Pass Filtering
portable cases in existence. The vertical height is
In order to deliver superlative performance and 1.75 inches for the EQ341 and EQ351, and 3.5
control, the EQ351 and EQ355 graphic equalizers inches for the EQ355. The depth is 7 inches,
incorporate independent variable Hi Pass (low cut) exclusive of power cord.
and Low Pass (high cut) filters. Having separate
Rugged construction and solid audio performance
and variable precision control for both the Hi Pass
make these equalizers particularly well suited to
and Low Pass filters, allows the user to custom
fixed installation as well as touring live sound
tailor the audio signal to perfection.
systems.
Many competing products only feature shelving
switches which have a fixed frequency point. Precision and Quality
Others do not have separate filtering for both high When considering quality equalization, the ART
and low frequencies. These designs do not offer EQ300 Series of graphic equalizers are an
the precision or control of the ART EQ300 Series. excellent choice. They deliver extremely precise,
powerfully flexible and simply great sounding
Additional Controls and Indicators
equalization, with the quality features and reliable
The EQ300 Series of graphic equalizers utilize a design necessary for top-level audio performance.
variable output level control, clip level indicator,
ground lift switch, and selectable line voltage.
Additional features include selectable scale
switching - high slider resolution (±12dB) or normal
resolution (±6dB), active balanced and unbalanced
input/output connectors, and RFI filtering.
4GENERAL INFORMATION
Your ART equalizer is a professional quality unit perfect for virtually any audio application where
frequency tailoring is needed. It’s features include: constant-Q circuitry with accurate center
frequencies, selectable ±6dB or ±12dB range, active balanced and unbalanced input and output
connectors, RFI filters, independent variable Hi Pass (low cut) and Low Pass (high cut) filters (for the
EQ351 and EQ355), variable input level control, passive bypass switch, clip level indicator, ground lift
switch, and selectable line voltage. Rugged construction and solid audio performance make these
equalizers particularly well suited to fixed installation as well as touring live sound systems.
INSTALLATION
This series of equalizers are designed for mounting in a standard 19” equipment rack or one of the
many rack-type portable cases available on the market. The vertical height is 1.75 inches for the
EQ351 and EQ341, and 3.5 inches for the EQ355. The depth is 7 inches, exclusive of the power
cord.
POWER CONNECTORS
These equalizers have internal power supplies and are designed for operation with 120 or 240 volt
(as determined by the rear panel line voltage switch), 50-60Hz mains supply. In new installations and
portable sound systems, or any situation where the mains power is in question, it is wise to confirm
the voltage and select the appropriate line voltage setting BEFORE connecting the equalizer to power
sources.
INPUT/OUTPUT CONNECTIONS
The EQ300 series graphic equalizers have three sets of input and output connectors wired in parallel:
1/4" phone, XLR, and RCA connectors. Only one of the three inputs should be used per channel. Any
combination of output connectors may be used.
1/4" phone jack connections may be used balanced or unbalanced. When balanced, the tip is High
(+), the ring is Low (-) and the sleeve is Ground. To use unbalanced, use a mono 1/4” phone cable,
which will automatically ground the ring to the sleeve.
XLR connections are balanced where pin 2 is High (+), pin 3 is Low (-), and pin 1 is Ground.
RCA jack connections are unbalanced.
SIGNAL LEVELS
Signal levels from -10dBm to +4dBm are considered normal with maximum levels of approximately
+18dBm balanced or +22dBm unbalanced. Do not connect microphones directly to the equalizer.
Most microphones, as well as instrument pickups, require a preamp to get the signal level up to a line
level. The outputs of the equalizer are also designed to connect into line level inputs and should not
be connected into sensitive microphone or instrument Inputs for best results.
5CHASSIS GROUNDING
The equalizers are equipped with a rear panel grounding screw and Ground Lift switch. The Ground
Lift switch should normally be set to the GND position. After set up, if your system exhibits excessive
hum or buzzing, the problem may be a due to a ground differential between your equalizer and other
equipment in the same system. The Ground Lift switch lets you try several combinations to minimize
system hum.
NOTE: ALWAYS TURN YOUR AMPLIFIERS DOWN BEFORE CHANGING GROUNDS.
Try different combinations of lifting grounds on units that are supplied with ground lift switches or
make sure all chassis are connected to earth ground, either through the AC Power cord grounds or
by the rear panel grounding screws.
If the EQ300 series equalizer is mounted in a grounded rack of equipment, the ground to the ground-
ing screw of the equalizer may be lifted to prevent multiple ground paths, which may cause a ground
loop to occur.
INITIAL SETUP
Before starting to equalize your sound system there is some information you should know and
procedures you should follow. Your equalizer is equipped with a bypass switch. The BYPASS switch,
when activated, lights the bypass LED and cancels all equalization settings while allowing signal to
flow directly through the unit at unity gain.
Also included is a RANGE selection switch with LED indicators, ±6dB (green), ±12dB (yellow). This
switch changes how much effect the slide controls have. In addition to the RANGE selection switch
there is an output LEVEL control potentiometer. The LEVEL control operates between off and +6dB.
Note: If there is too much gain, your equalizer has a red LED CLIP indicator that illuminates when
signals are within 6dB of clipping. If the CLIP LED flashes occasionally, this is okay, but if this LED is
on steadily you should reduce the level control.
Here are some tips to help you with the initial set up:
1. Set channel output LEVELs to the center detent (0dB) on the front panel.
2. Select the BYPASS switch to bypass the equalizer. (Note: The red LED is on)
3. Set the frequency slide controls to the center detent (0dB).
4. If applicable, set the HI PASS filter to 10Hz and the LOW PASS filter to 40kHz.
5. Select the ±6dB RANGE. (Note: The green LED is on)
6. Apply a signal to the system and if the CLIP LED is on, reduce your signal to the unit.
7. Unselect the BYPASS switch (Note: The red LED is off)
8. If the CLIP LED is on, turn down the Output LEVEL control.
9. You may now start equalizing your system.
10. If you do not have enough equalization control, switch the range switch to the ±12dB setting.
6OPERATION
FRONT PANEL CONTROLS
POWER SWITCH
To turn the equalizer on or off, press the upper or lower portion of the POWER switch. CAUTION:
Always turn on your equalizer BEFORE your power amplifiers are turned on, and always turn off your
equalizer AFTER your power amplifiers have been turned off.
FILTER LEVEL CONTROLS
Each of these sliders controls the signal level of each of the 31 (or 15) bandpass filters. A detent at
the center position helps center the controls for a flat response.
FILTER RANGE SWITCH & INDICATORS
The gain range of the filter sliders is switchable (as a group) from ±6dB to ±12dB for maximum
boost/cut capability. At ±6dB the green LED will illuminate, and at ±12dB the yellow LED will
illuminate.
BYPASS SWITCH & CLIP INDICATOR LED
When the red BYPASS LED is illuminated, this indicates that the unit or channel is in the bypass
mode. Signal is routed directly from the input to the output without passing through any circuitry (often
referred to as ”hard-wire bypass”). Use this switch to compare equalized and unequalized material, or
to bypass the EQ section in the event of total unit failure.
The red CLIP LED illuminates if any section of the equalizer is near clipping. Occasional flickering of
this LED is acceptable, but if it remains on more than intermittently, you should reduce the output
level of the preceding equipment or, if that is not possible, turn down the equalizer’s LEVEL control to
avoid audible distortion.
7HI PASS FILTER (LOW-CUT FREQUENCY CONTROL) (EQ351 and EQ355 only)
To cut down on unwanted low frequency signals, this control determines the roll-off frequency of the
Hi-Pass Filter (HPF). The roll-off frequency can be adjusted from 10Hz to 250Hz by turning this knob.
Because of its high roll-off slope, the HPF can be efficiently used to cut down hum and low frequency
noise from preceding instruments, or to reduce low frequency resonances, when speakers are
installed in an enclosed acoustic environment. It is also very effective at removing power robbing and
potentially destructive rumble.
LOW PASS FILTER (HIGH-CUT FREQUENCY CONTROL) (EQ351 and EQ355 only)
To cut down on unwanted high frequency signals, this control determines the roll-off frequency of the
Low-Pass Filter (LPF). The roll-off frequency can be adjusted from 3kHz to 40kHz by turning the
knob. Because of its high roll-off slope, the LPF can be effectively used to cut down the high
frequency noise from preceding instruments, or roll-off excessive high frequency sounds to obtain a
more natural sound in some acoustic situations.
LEVEL CONTROL
This controls the output signal level from the equalizer. Turn this control down if the CLIP LED
illuminates steadily (meaning too strong an input signal). Unity gain can be set by adjusting this knob
so that as you toggle the BYPASS switch the overall level sounds the same.
Signal levels should be kept normalized through the equalizer. That is, the signal level, when
bypassed, should be the same (or a little lower) than when active.
8REAR PANEL CONNECTORS & CONTROLS
POWER CORD
This cord is used to connect the AC power source to your equalizer. CAUTION: Equipment for USA
installation includes a power cord with a three-pin polarized plug. DO NOT REMOVE THE CENTER
GROUNDING PIN.
FUSE HOLDER, LINE VOLTAGE SWITCH & GROUNDING SCREW
This fuse holder contains the AC primary fuse. This fuse should be replaced with the same type fuse
if it is blown. If they continuously blow, stop replacing fuses and refer servicing to qualified personnel.
CAUTION: After checking the AC supply voltage, be sure that the correct fuse is in the fuse holder -
0.5Amp (500mA) for 95-125VAC, as well as for 220-240VAC. When changing the fuse, make sure
that the holder is seated securely. The position of the line voltage switch determines the line voltage
range and is labeled on the switch
GROUND LIFT SWITCH
This switch is used to disconnect signal ground from the mains and chassis earth ground. You may
set the switch to the LIFT position if ”Hum”, caused by a ground loop, can be heard at the speakers.
9INPUT/OUTPUT CONNECTORS
EQ341
EQ351
EQ355
101/4" TRS Phone Jacks
The TRS (Tip Ring Sleeve) connectors are balanced and wired as Tip = High (+), Ring = Low (-), and
Sleeve = Ground.
For balanced connections using 1/4" TRS phone plugs, wire them as follows:
tip = High (+)
ring = Low (-)
sleeve = Ground
For unbalanced connections using 1/4" TRS or mono (tip/sleeve) phone plugs, wire them as follows:
tip = High (+)
ring = no connection
sleeve = Ground
XLR Connectors
The XLR input connectors are balanced and wired as Pin 2 = High (+), Pin 3 = Low (-), and Pin 1 =
Ground.
RCA Jacks
The RCA jacks are unbalanced, with the pin High (+) and the outside Low (-).
11APPLICATIONS
Graphic equalizers may be used wherever modification of the frequency contour of a sound system is
needed. A graphic equalizer is a solution to any number of sound problems or creative urges.
Typical reinforcement application of Equalizaton of audio signals from a
a two channel equalizer mixer
Return
P Amp Speaker
Mixer EQ
P Amp Speaker Mixer EQ
Send
Equalization of a musical instrument Equalization of an effects loop
Instrument Amp
Amp
PreAmp EQ
Stereo
Amp Effects
PreAmp loop EQ Amp
12WARRANTY INFORMATION
Limited Warranty
Applied Research and Technology will provide warranty and service for this unit in accordance with
the following warrants:
Applied Research and Technology, (ART) warrants to the original purchaser that this product and the
components thereof will be free from defects in workmanship and materials for a period of three years
from the date of purchase. Applied Research and Technology will, without charge, repair or replace,
at its option, defective product or component parts upon prepaid delivery to the factory service
department or authorized service center, accompanied by proof of purchase date in the form of a
valid sales receipt.
Exclusions
This warranty does not apply in the event of misuse or abuse of the product or as a result of
unauthorized alterations or repairs. This warranty is void if the serial number is altered,
defaced, or removed.
ART reserves the right to make changes in design or make additions to or improvements upon this
product without any obligation to install the same on products previously manufactured.
ART shall not be liable for any consequential damages, including without limitation damages resulting
from loss of use. Some states do not allow limitations of incidental or consequential damages, so the
above limitation or exclusion may not apply to you. This warranty gives you specific rights and you
may have other rights, which vary from state to state.
For units purchased outside the United States, an authorized distributor of Applied Research and
Technology will provide service.
13SERVICE
The following information is provided in the unlikely event that your unit requires service.
1. Be sure that the unit is the cause of the problem. Check to make sure that the unit has power
supplied, that all cables are connected correctly, and that the cables themselves are in working
condition. You may want to consult with your dealer for assistance in troubleshooting or testing
your particular configuration.
2. If you believe that the ART unit is at fault, go to www.artproaudio.com. You may contact Customer
Service for more assistance, or directly request a Return Authorization for service in the
“resources” area of the website.
3. If you are returning the unit for service, pack the unit in its original carton or a reasonable
substitute. The original packaging may not be suitable as a shipping carton, so consider putting
the packaged unit in another box for shipping. Print the RA number clearly on the outside of the
shipping box. Print your return shipping address on the outside of the box.
4. Include with your unit: a note with the RA number and your contact information, including a return
shipping address (we cannot ship to a P.O. box) and a daytime phone number, and a description
of the problem, preferably attached to the top of the unit. Also include a copy of your purchase
receipt.
Fill in the following information for your reference:
Date of purchase ___________________
Purchased from ___________________
Serial number ___________________
14SPECIFICATIONS
EQUALIZER
Bands 2 x 15, 2/3 octave, ISO spacing (EQ341)
1 x 31, 1/3 octave, ISO spacing (EQ351)
2 x 31, 1/3 octave, ISO spacing (EQ355)
Type / Accuracy Constant-Q / 3% center frequency
Travel 20mm w/ positive center detent
Range ±6dB or ±12dB, selectable
Overall Gain Range Off to +6dB (unbalanced out) sliders centered
Off to +12dB (balanced out) sliders centered
INPUTS
Type Active balanced/unbalanced
Connectors 3-Pin XLR, 1/4” TRS (balanced), RCA (unbalanced)
Impedance 20k Ohms balanced; 15k Ohms unbalanced
Maximum Level +22dBm (level control at center)
OUTPUTS
Type Active balanced/unbalanced
Connectors 3-Pin XLR, 1/4” TRS (balanced), RCA (unbalanced)
Impedance 50dB
POWER (switchable) 95-130VAC, 50/60Hz
190-250VAC, 50Hz
POWER CONSUMPTION 12 Watts
SIZE 1.75” H *19” W *7” D (1U) (EQ351 and EQ341)
(4.45cm * 48.3cm * 17.8cm)
3.5” H *19” W *7” D (2U) (EQ355)
(8.9cm * 48.3cm * 17.8cm)
WEIGHT 7.1 Ibs (3.2 kg) (EQ351 and EQ341)
11.6 Ibs (5.2 kg) (EQ355)
15www.artproaudio.com
E-mail: cserve@artproaudio.com
© 2010 Applied Research & Technology
EQ341, EQ351, EQ355
V1.0
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